/Engine/Source/Runtime/Foliage/Public/InstancedFoliageActor.h
Change all instances based on one component to a new component (possible in another level). The instances keep the same world locations
static void MoveInstancesToNewComponent ( [UWorld](API\Runtime\Engine\Engine\UWorld) * InWorld, [UPrimitiveComponent](API\Runtime\Engine\Components\UPrimitiveComponent) * InOldComponent, [UPrimitiveComponent](API\Runtime\Engine\Components\UPrimitiveComponent) * InNewComponent )